If you have not had a problem in 4 years and now you do you may look into
other electrical hardware on the tower.
It may me lighting systems that have started to arc when there is heavy rain or
some other electrical problems caused
by rain or wind.
If it is particularly cold it could be ice on the antenna which detunes it.
Water has a very high dielectric constant.
Unlikely corona.
73
bill wa4lav
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